Overview
ISO 9270-2:2010 defines the dimensions and tolerances for 7/24 taper spindle noses with tenons used in automatic tool changers, specifically spindle-nose forms J and JF. The standard provides millimetre-based dimensional tables, geometry rules and designation rules to ensure interchangeability with corresponding tool shanks of forms J, JD and JF as specified in ISO 7388-2.
Key topics and technical requirements
- Scope and sizing: Covers 7/24 taper spindle noses intended for tool shank sizes (shank numbers) used in automatic tool changers; detailed dimensional tables (d, l, tenon dimensions) are given for each size.
- Tolerancing and units: All dimensions in millimetres; tolerancing principles follow ISO 8015. Unspecified tolerances default to ISO 2768-1 (linear/angular) and ISO 2768-2 (geometrical).
- Thread and fastener specifications: Thread forms and limits reference ISO 68-1 and ISO 965-2; fixing screws conform to ISO 898-1 (mechanical properties) and ISO 4762 (hexagon socket head cap screws).
- Tenon and assembly details: Tenon dimensions, slot fits and fixing-screw recommendations are specified to guarantee secure clamping and correct location (tables and figures illustrate these features).
- Form JF (coolant option): The JF variant allows two holes in the spindle face for inner coolant supply; the standard supplies dimensions for these holes as supplementary data.
- Materials and treatment: Spindle noses shall be heat treated with suitable strength, hardness, toughness and wear-resistance considerations.
Applications and who uses this standard
ISO 9270-2 is essential for:
- Machine tool and spindle manufacturers designing automatic tool changers and spindles to ensure tool interchangeability.
- Tooling and holder suppliers producing tool shanks (per ISO 7388-2) and tenons compatible with spindle noses of forms J/JF.
- CNC machine integrators and maintenance engineers specifying replacement spindle noses, retention hardware and coolant provisions.
- Quality and inspection teams verifying dimensional compliance, tolerances and thread/fastener conformance.
Benefits include consistent tool interface, reliable automated tool changes, improved uptime, and simplified procurement through standard designation (example: “Spindle nose ISO 9270-2 – J40”).
Related standards
Keywords: ISO 9270-2:2010, 7/24 taper spindle noses, automatic tool changers, forms J and JF, dimensions and tolerances, ISO 7388-2, tenon, inner coolant supply, spindle manufacturers, CNC tooling.
Open preview (PDF)7/24 taper spindle noses for automatic tool changers — Part 2: Dimensions and designation of spindle noses of forms J and JF